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#1
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My question is are the x heads really any good and if they are ok to put on a 72 318 ? I have the Intake too match and a 71 T.Q for on top.Should it be bored ?,would a stock 340 bumpstick work ?,What about planing heads and intake ? cost not really a factor.
willing for any comments or sugestions ------------------ 72 charger 85 D150 p/u 85 caravelle |
#2
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I'm not sure what they came on, but there is a later model head(pre-magnum, I think) that is much better. Wish I could be more specific, but it has much improved exhuast ports. They actually have a floor in them!
Have flowed a X back-to-back to a J-head, and they were within error. The later head does use a 1.88" Intake valve. They're legal in NHRA stock, for 340-360's. Maybe you can check w/ them for numbers. But, I wouldn't pay an extra dime for the X-head. |
#3
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"X" heads would work on a 318 in a HI-PO/race setting. The heads are hard to find these days. The heads that dodgit is thinking about are the 308's i beleive.
The 308's (I think) would be a better choice to use because: There easy to get , offer good flow, espes. when ported. The "X" heads that around today may have there cores shifted. And thats not good at all. I don't know witch one would out do the other. A 340 cam would offer an improvment , but what is the goal you have in mind. There could be a better cam for it. Bore the eng. only if it needs it. Do you mean to mill the heads & intake? (planing ?) I would check out the heads to see need to be milled first. If they do , the intake will need it as well to match up right. From there you can choose a piston as to aviod a compres. ratio to high or low. |
#4
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i dont think a 2.02 valve will fit a 318 bore without notching.
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#5
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Sorry Guys I'm fairly new at this and I'll try explaining more ,so here goes...
What I would like to end up with is something close to 300hp? 308 heads I'm not sure I know what you are talking about.The heads I have are 1968's p/n 2531894-E & D(guess L/H&R/H) they are in great shape!Yes RUMBLEFISH I meant milling the heads & intake.And when you said don't bore the cyl's unless needed, wouldn't I have to do it to get to the hp I'm looking for ? FAST68PLYMOUTH- Whats notching? (is that on the top of the pistons? ------------------ 72 charger 85 D150 p/u 85 caravelle |
#6
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Bore noching is required work on the 273. It is when you grind away at the cycl. wall in order to make room for the vavle.
I have never put a 2.02 vavle on a 318, but I don't think you will have to worry. Vavle notching on the piston is cutting a relief ( a spot) on top of the piston so the vavle dosn't hit the head. This may be need with HIGH lift cams. There is NO L/H-R/H CYL HEAD. They will fit what ever side you lay them on. And no. You don't have to bore out the cyl. bores to get the power your looking for. You'll only get a few more cubes. There is power in cubic inch's, but not a lot in only a few. If you put 2 , 318's on a dyno, one stock bore ,the other .030 bigger. The differance would be small. Most of the power is in the heads. Build a good short block. That is where a relieable eng. comes from. A pocket port of the head will free up the H.P. you looking for. 308 - the last 3 #'s that are cast in the head. This head should be easy to find. At least so i'm told. If your heads are in good shape...use them. The #'s 2531894 are the casting #'s.that head would be refered as a 894 head only because of the last 3 #'s. Or a '68-71, 340 head. As far as being new, don't worry, we were all new at one time with a lot of ???'s to. And we stii have them. Just ask, no fear. The stupid ????'s are the ones you don't ask. Even if you had the ans.in the back of your head and could not find it. We are here to help others. |
#7
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I guess I'll add to this also. I fully agree on the X vs the J head for performance. The J head is a 915 casting and the earlier version did actually use the 2.02 intake then switched to the smaller valve soon on. If you got to just have OLD, then go with the J Head. They are much cheeper. What I believe you are referencing are the late 80's high swirl design. I believe the 308's were used in the 89-91 360's and are definantly better than the Old style heads. The 302's are the ones that I think were on the 318's and is the one you are actually looking for. Both have a small cumbustion chamber and great exhaust flow. From what I have seen the 308's are in much higher demand now since the secret has been let loose but the 302's are much easier to come by. Thats just my opinion though. Good luck...DAVE
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#8
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Thanks so much RUMBLEFISH .I'm sure I'll be back with more questions at a later time.I really appreciate your help..This site is great !!
Keep the pedal down !!!!and happy moparing ------------------ 72 charger 85 D150 p/u 85 caravelle |
#9
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I have to add 2 more things
1.......I fully agree that heads are the major source of power so dont scrimp in this area and learn as much as possible before you proceed. There are a lot of threads in this site. Just use the search button on the top right and type in 302 2.......Dodgit..this doesent really affect you but I just gotta tell eveyone again....Beware of the "fools gold" You know...the guy who is selling a 915 head and thinks its the treasured TA because they are either ignorant or a crook. ------------------ |
#10
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I'm back with one more question? Are the x heads worth putting on OR should I just use the heads I've got on it now (318) and port and a 3 angle job.
------------------ 72 charger 85 D150 p/u 85 caravelle |
#11
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DAVE JONES...Good tip!!!!
dodgit ... He's right , learn all you can before you leap!! |
#12
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Just what is the goal you have in mind? Tell me what your combo is.
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#13
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As far as using your current heads, rumblefish 360 is right. It all depends on what you want it for. My opinion on this being a 318.....
OPTION 1.......Keep it cost effective and basic. redo your current heads and get and a basic port job. Set the heads up to achieve 9 to 1. 1 5/8 headers and look at the stall and gears and go light them up. OPTION 2.......Go for a basic rebuild on a junk 360 like Mopar muscle did 6 months ago and jam about 400 hp. OPTION 3...To be able to verbally masterbate to all the other rodders like alot of people do, make sure the setup consists of no less than the following........................ take the 318 and bore it .100 over, stoke it big and you gotta have 13 to 1 on it also. make sure that the header tubes are 3" or larger, gotta get those 6.23 gears to drive the 32" Hoosiers, Blow it, choke it, chrome it...then pat it dry with a wet towel. Ya I'm breakin your aggits with number 3 so dont let yourself get caught up with that one......good luck on your decision. ------------------ |
#14
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RUMBLEFISH my goal is just to be able to keep most of the other brands in my mirror.
I kinda figured that 300 hp would be my goal to start with and later maybe a 360 beefed up.All I want to do is street cruising and a little playing at times. (if you know what I mean).I've got hooker headers,Dual 21/2 exhaust,904 trans with the slap stick, and only 271's or 291's not sure, but no sure grip.. Which I'm looking for now,with bigger gears maybe 323's or 391's. Hope this helps a little more. ------------------ 72 charger 85 D150 p/u 85 caravelle |
#15
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Check DAVE JONES reply. ( ps DAVE J #3 is funny)
tHE SMALL 318 HEAD WILL WORK BEST FOR WHAT YOUR LOOKIN AT. kEEP THE "x" HEADS FOR YOUR 360. (sorry about the caps) If it's in the pocket ($$$$$$) port the head in the bowl with a 1.88valve being the max in intake size. (Stock is 1.74 , and it will do fine with the 340 cam u typed about first in this thread. Mostly because its a small cid eng.) Look for the 8 3/4 rear and a higher ratio than the 3.23. There O.K. but it won't help you rocket off. The 3.91's are better for the ZOOOOM your lokkin for. |
#16
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RUMBLEFISH- I thought Dave jones #3 was also funny,since it is far from my reach, but the other two where great !
I have to thank you all for the great info.. So now all I have to find is someone to do the heads. (I;m sure I can find someone up here in the great white north)Ha,Ha. Thanks.see you later ------------------ 72 charger 85 D150 p/u 85 caravelle |
#17
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Trenton eh?
If memory serves me right that's a bit past Toronto right? Close to Kingston? Well, this might be a bit far for you...but I got my heads done at Atchinson's in London, pretty good guys there. They are fairly big into racing and they do know what they are doing. Mind you it's not a MOPAR only shop. Anyways, noticed the 85 M-body in your sig, is that what you're building up? |
#18
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Thats because #3 is not a do-able thing because he forgot to and the quazi-moto super turbo to force feed the 10-71 super charger.
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#19
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DIPLOMAT360-Yes you are right with the location!Thanks for the tip on a head "guru", but you are right it is a little far,someone told me about a guy in Peterborough,I think I'll check him out.
And for your question??- is it the caravelle that I am building,NO its the charger..turn more heads. RUMBLEFISH- No wonder why I had a hard time figuring how that combo would work ------------------ 72 charger 85 D150 p/u 85 caravelle |
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